%0 Electronic Article
%A Funcke, Lena
%A Jansen, Karl
%A Kühn, Stefan
%T CP-violating Dashen phase transition in the two-flavor Schwinger model: a study with matrix product states
%N arXiv:2110.15642
%M PUBDB-2022-07360
%M arXiv:2110.15642
%M MIT-CTP/5348
%D 2022
%Z 9 pages, 3 figures, proceedings of the 38th International Symposium on Lattice Field Theory, 26th-30th July 2021, Zoom/Gather@Massachusetts Institute of Technology, version 2: updated funding information
%X We numerically study the Hamiltonian lattice formulation of the two-flavor Schwinger model using matrix product states. Keeping the mass of the first flavor at a fixed positive value, we tune the mass of the second flavor through a range of negative values, thus exploring a regime where conventional Monte Carlo methods suffer from the sign problem and may run into instabilities due to zero modes. Our results indicate a phase transition at the point where the absolute value of the second flavor mass approaches the first flavor mass. The phase transition is accompanied by the formation of a fermion condensate, a steep drop of the average electric field, and a peak in the bipartite entanglement entropy. Our data hints at a second order transition, which is the 1+1D analog of the CP-violating Dashen phase transition in QCD.
%K CP: violation (INSPIRE)
%K fermion: condensation (INSPIRE)
%K entropy: entanglement (INSPIRE)
%K critical phenomena (INSPIRE)
%K flavor (INSPIRE)
%K Schwinger model (INSPIRE)
%K quantum chromodynamics (INSPIRE)
%K zero mode (INSPIRE)
%K Hamiltonian (INSPIRE)
%K stability (INSPIRE)
%K lattice (INSPIRE)
%K electric field (INSPIRE)
%K formation (INSPIRE)
%K Monte Carlo (INSPIRE)
%F PUB:(DE-HGF)25
%9 Preprint
%R 10.3204/PUBDB-2022-07360
%U https://bib-pubdb1.desy.de/record/486574